66538818960 has 160 divisors (see below), whose sum is σ = 207791879040. Its totient is φ = 17613225984.

The previous prime is 66538818959. The next prime is 66538819003. The reversal of 66538818960 is 6981883566.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 66538818894 and 66538818903.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25798951 + ... + 25801529.

It is an arithmetic number, because the mean of its divisors is an integer number (1298699244).

Almost surely, 2^66538818960 is an apocalyptic number.

66538818960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66538818960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103895939520).

66538818960 is an abundant number, since it is smaller than the sum of its proper divisors (141253060080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66538818960 is a wasteful number, since it uses less digits than its factorization.

66538818960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3345 (or 3339 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 66538818960 in words is "sixty-six billion, five hundred thirty-eight million, eight hundred eighteen thousand, nine hundred sixty".